686052449 has 4 divisors (see below), whose sum is σ = 709709460. Its totient is φ = 662395440.

The previous prime is 686052443. The next prime is 686052457. The reversal of 686052449 is 944250686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 389351824 + 296700625 = 19732^2 + 17225^2 .

It is a cyclic number.

It is not a de Polignac number, because 686052449 - 2²⁰ = 685003873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686052443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11828462 + ... + 11828519.

It is an arithmetic number, because the mean of its divisors is an integer number (177427365).

Almost surely, 2^686052449 is an apocalyptic number.

It is an amenable number.

686052449 is a deficient number, since it is larger than the sum of its proper divisors (23657011).

686052449 is a wasteful number, since it uses less digits than its factorization.

686052449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23657010.

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 686052449 is about 26192.6029443429. The cubic root of 686052449 is about 881.9672110880.

The spelling of 686052449 in words is "six hundred eighty-six million, fifty-two thousand, four hundred forty-nine".